Abstract : This report presents the results of Phase 2 research on decision making in an evolving situation. As in Phase 1, the problem context was situation assessment by trained Army intelligence analysts working in pairs. Participants were given an initial battlefield scenario and asked to determine the enemy's most likely avenue of approach and to give their level of confidence; subsequently they were asked to reconsider their decisions after receiving each of three updated intelligence reports that contained some items that confirmed and some that did not confirm their early hypothesis. Finally, the participants were asked to rate each information item in terms of the degree to which it supported or contradicted their hypotheses. (AN)